#define _CRT_SECURE_NO_WARNINGS 1
#include <vector>
using namespace std;
class Solution {
public:
    int findPeakElement(vector<int>& nums)
    {
        int left = 0, right = nums.size() - 1;
        while (left < right)
        {
            int mid = (left + right) / 2;
            if (nums[mid] < nums[mid + 1])
            {
                left = mid + 1;
            }
            else
            {
                right = mid;
            }
        }
        return left;
    }
};